alexa Hybrid moving bed biofilm reactors: a pilot plant experiment.
Environmental Sciences

Environmental Sciences

Journal of Bioremediation & Biodegradation

Author(s): Di Trapani D, Mannina G, Torregrossa M, Viviani G

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Abstract The growing increment of the urbanization and, on the other hand, the even more strict effluent limits imposed by the Water Framework Directive for the receiving water body quality state have led to the need for upgrading several existing WWTP. With this respect HMBBR systems are an innovative solution since they allow to upgrade existing high loaded WWTP without building new tanks. However, some uncertainties in their design, maintenance as well as performance have to be addressed due to their recent acquisition compared with well consolidated technologies such as activated sludge systems. In this light, a data gathering campaign on a HMBBR pilot plant has been performed. The aim was to detect the performance of such new technology as well as to survey the influencing effect of the carrier media filling ratio. Indeed, there may be problem of competitiveness between attached and suspended biomass that jointly operate in the same system for carbon and nitrogen removal. Such competitiveness may lead to a worsening of the system efficiency. The results are interesting and the gathered data in the experimental period show a slight difference in terms of performance behaviour, between the two systems (35 and 66\%). Such result leads to address the filling ratio choice towards the 35\%. IWA Publishing 2008. This article was published in Water Sci Technol and referenced in Journal of Bioremediation & Biodegradation

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